Helpp

So I take birth control right just the pills so last month. when I went to go get a new pack of them. there was 2 white ones at the end and two brown ones and I didn’t think anything of it. So I’m not sexually active I take them for really bad period cramps but, when I got to the brown ones they smelt and tasted like mint. I took the last brown one on Thursday and I still haven’t gotten my period or any cramping and I was supposed to get it like 3-4 days ago. I’m not sexually active so I don’t know what’s going on I’ve been on the pill for 2 years now. It’s really starting to freak me out.